Question

Abdul, while during to school, computes the average speed for his trip to be 20 Kmh^-1 on his return trip along the some route, there is less traffic and the average speed is 30 Kmh^-1. What is the average speed for Abdul’s trip?

Answer 1

i) Average speed of Abdul’s trip while driving to school = 20 Kmh^-1

Average speed = \(\frac{\textit{Total distance}}{{\textit{Total time taken}}}\)

Total distance = Distance travelled to reach school = t₁

∴ 20 = \(\frac{d}{t_1}\)

t₁ = \(\frac{d}{20}\) …………… (i)

While returning from school

Total distance = Distance travelled while returning from school = d Now total time taken = t₂.